I have a number of patches for php 53x but I don't know if they work for 5.4. I'm even not sure if they work correctly on 5.3 because I'm not using them in production on 5.3.
Some of the patches I have made based on other older patches I found somewhere on the net.
I could send them to you so you could try if they make it work on 5.4 or you can adopt them to make them work on 5.4.
Let me know if you're interested and how I can send them to you.
Regards,
Simon